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Câu 4.Với các phép lai sau:1.P:AAbbDD x aaBbdd 2.P :AabbDd x aaBbdd 3.P:AABbDD x aabbdd 4.P:AAbbDD x aaBBdd 5.P:aaBBDD x Aabbdd 6.P:aabbDD x AABBdd Trong trường hợp gen có lợi là trội hoàn toàn, hiện tượng ưu thế lai được giải thích bằng hiện tượng tập trung ác gen trội có lợi thì phép lai nào sau đây tạo ra F1 có ưu thế lai cao nhất ?
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